Work-holder for metal-working machines.



Tin-v R. W. LORD.

WORK HOLDER FOR METAL WORKING MACHINES. APPLICATION FILED 001'. s, 1912.

1,Q85,8 1 6 Patented Feb. 3, 1914.

WIINESS ES 8 5 E w INVENTOR f'" I My PATENT OFFICE.

ROBERT W. LORD, OF S-KOWHEG-AN, MAINE.

WORK-HOLDER, FOB.- METAL-WORKING MACHINES.

Specification of Letters Patent.

Patented Feb. 3,1914.

Application filed October 3, 1912. Serial No. 723,720.

To all whom it may concern Be it known that I, ROBERT W. Loni), a citizen of the United States, residing at Skowhegan, in the county of Somerset and State of Maine, have invented new and useful Improvements in \Vork-Holders for Metal- \Vorking Machines, of which the following is a specification.

This invention relates to work-holders for metal working machines.

The present invention, which is an improvement on the work-holder set forth in my Patent No. 603,025, April 26, 1898, has for its objects, first, the provision of a novel stepped chock providing means for more rapid and finer adjustment of the strap than is possible with the work-holder of my aforesaid patent; second, to provide a stepped chock and strap constructed and combined in a new manner whereby adjustment of the strap to difierent heights may be obtained and the strap may be reversed to effect a finer adjustment, as will appear more fully hereinafter.

The invention consists, first, of a chock of novel construction, and second, in a strap and chock combined and associated in a new manner.

In the accompanying drawings: Figure 1 is a perspective view showing the work-holder in use; and Fig. 2. is a side view, partly in section, wit-h the strap shown in both full line and dotted line positions.

The strap 1 is substantially the same as the strap shown in my aforesaid patent but it is preferably made as an open U-shaped loop without the intermediate brace between the sides, thus permitting the locating of the work-fastener bolt 2 at any position along the length thereof. The legs of the strap are connected by a transverse member 3 which is preferably removable and is p0- sitioned in off-set relation to the longitudinal axis of the strap, that is, nearer to the edge 4 than to the edge 5 so that upon reversal of the strap, without having to reverse the stepped chock, a finer adjustment of the strap is possible, as will presently appear.

My new stepped chock 6 has a base 7 which is preferably separate therefrom and secured thereto by suitable means, as, for instance, by countersunk screws 8. The chock has a plurality of steps 9 at different heights thereof on one side of its inner open space and on the other side it is provided with a plurality of steps 10 arranged in alternation with the steps 9. The U-shaped strap 1 straddles the chock 6, the pin 3 passing through the open part thereof and being adapted to rest upon any of the steps 9 or 10. It will be observed that the strap can be swung over so that the pin 3 will engage any of the steps 9 and 10' and thus afford a finer vertical adjustment of the strap due to the different distances the surfaces a and 5 are located from the pin 3.

I do not limit myself to the use of both rows of steps 9 and 10 as it is evident thatthis structure may be modified while still permitting the reversal of the strap and the finer adjustment, but the double series 9 and 10 are preferably employed to afford all necessary vertical adjustments of the strap necessary to the clamping of work of different heights on the metal working machine.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination with a chock having a base and a series of steps at different heights above said base, of a chock-engaging member comprising a U-shaped strap having a transverse member which connects its legs and is adapted to be moved from one step to another.

2. The combination with a chock having two series of steps arranged in alternation, of a strap having means adapted to engage the steps of either series.

3. The combination with a chock having opposing series of internal steps, of a strap having means to engage either series of steps.

4. The combination with a chock having opposing series of internal steps whose parts or teeth are arranged in alternation, of a strap having means adapted to engage either series of steps.

5. The combination with a chock having opposing series of internal steps, of a reversible strap having a member adapted to engageeither series of steps, said member being disposed nearer to one side of the strap than to the other side thereof.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ROBERT W. LORD.

Vitnesses EMMA P. BURRILL, R. B. BURRILL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). 0. 

